Decreased domain size and improved crystallinity by adjusting solvent-polymer interaction parameters in all-polymer solar cells
Decreased domain size and improved crystallinity by adjusting solvent-polymer interaction parameters in all-polymer solar cells
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通过调整全聚合物太阳能电池中溶剂-聚合物相互作用参数来减小域尺寸并提高结晶度
DOI：
10.1002/polb.23629
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发表时间：
2015
影响因子：
--
通讯作者：
Yanchun Han
中科院分区：
文献类型：
--
作者：
Ke Zhou;Jiangang Liu;Mingguang Li;Xinhong Yu;Rubo Xing;Yanchun Han
我们研究了溶剂-聚合物相互作用对聚（3-己基噻吩）（P3HT）和聚（3-己基噻吩）的形态、结晶度和器件性能的影响。 聚{2,7-(9,9-二十二烷基芴)-alt-5,5-[4',7'-双(2-噻吩基)-2',1',3'-苯并噻吩-二醇]} (PF12TBT)共混体系。选择与给体和受体材料具有相似结构单元的3-己基噻吩（3-HT）作为溶剂添加剂添加到主溶剂氯苯（CB）中，以调节溶剂-聚合物相互作用。根据计算的溶解度参数 (δ) 和相互作用参数 (χ12)，随着 CB 溶液中 3-HT 百分比从 5% 增加到 30%，聚合物和溶剂分子之间的溶剂-聚合物相互作用略有下降。结果，形成了纳米级相分离和互连的形态，供体和受体的域尺寸均减小。同时，由于掺入3-HT后薄膜干燥时间延长和分子平面度增加，P3HT分子的有序性得到增强。当3-HT百分比达到10%时，功率转换效率（PCE）逐渐提高至1.08%，这可归因于短路电流（Jsc）和填充因子（FF）的增强。然而，当 3-HT 百分比超过 20% 时，Jscan 和 FF 的降低最终降低了 PCE。 © 2014 Wiley periodicals, Inc. J. Polym。科学，B 部分：聚合物。物理学.2015,53, 288–296
We have investigated the effect of solvent–polymer interaction on the morphology, crystallinity, and device performance of poly‐(3‐hexylthiophene) (P3HT) and poly{2,7‐(9,9‐didodecyl‐fluorene)‐alt‐5,5‐[4′,7′‐bis(2‐thienyl)‐2′,1′,3′‐benzothia‐diaole]} (PF12TBT) blend system. 3‐Hexylthiophene (3‐HT), which had the similar structural units with both donor and acceptor materials, was chosen as the solvent additive to be added into the main solvent chlorobenzene (CB), to adjust the solvent–polymer interaction. With the 3‐HT percentage increasing from 5 to 30% in CB solution, the solvent–polymer interaction between polymer and solvent molecules decreased slightly according to the calculated solubility parameters (δ) and interaction parameters (χ12). As a result, nanoscale phase‐separated and interconnected morphology with decreased domain size of both donor and acceptor was formed. Meanwhile, the order of P3HT molecule was enhanced which resulted from the extended film drying time and increased molecular planarity after incorporation of 3‐HT. The power conversion efficiency (PCE) had a gradual improvement to 1.08% as the 3‐HT percentage reached 10%, which can be attributed to the enhanced short‐circuit current (Jsc) and fill factor (FF). However, when the 3‐HT percentage exceeded 20%, the decreasedJscand FF ultimately decreased the PCE. © 2014 Wiley Periodicals, Inc. J. Polym. Sci., Part B: Polym. Phys.2015,53, 288–296